Collosal figure of merit of transparent conducting nano-ribbon networks

An inexpensive, simultaneously transparent and conducting metallic nano-ribbon network can be obtained by exploiting the self-cracking property of the egg-white film, subsequently used as a sacrificial mask for metal sputtering. The process results in a network of metallic nano-ribbons ideally suited for electroplating. Due to large inter-ribon distance, an even 100-fold increase in the ribbon thickness has a negligible effect on the network transparency. Here we demonstrate this effect by developing a network with a colossal, by far the highest reported figure of merit of over 25000. This network can be used as an ultimate window electrode for solar cells, as well as LEDs.